Abstract
This chapter investigates the influences of potential and pH on environment-assisted cracking behavior (EAC) in order to identify the effects of environmental factors on EAC. EAC tests are conducted with the slow strain rate technique. The material chosen is Ti-6AI-4V. An aqueous solution of Na2SO4 is used for EAC tests. The solution is prepared with distilled water and reagent-grade chemicals. The slow strain rate tensile (SSRT) test equipment SSRT-MINI1000T with a glass cell is employed for the tests. The side and fracture surfaces of specimens are analyzed with a scanning electron microscope. The density of the cathodic current is observed during the EAC test at all potentials except +200 mV, at which the density of anodic current is observed. The current densities are virtually constant throughout the test period, and the density of cathodic current increases with the decrease in potential. Identical trends are observed at pH 3 and 7. At pH 3, the density of the cathodic current increases with decreasing potential. The maximum stress is almost identical to that in air, although it appears to decrease slightly at -300 mV. Therefore, almost no EAC susceptibility is observed at pH 3. Similar trends are observed at pH 7. At pH 1, a unique behavior in maximum stress against potential is observed.
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